Garland,
I think you have to diffeferentiate or bifurcate the "play it forward" concept.
I think there's a major difference in "aging" golfers who have lost their length to father time and golfers who haven't lost length due to the aging process.
For those in the "aging" category, eventually, they tend to move up, albeit not on the USGA's/PGA's timetable.
Ego's and hope tends to lag behind reality.
And, for them, moving forward occurs at some point.
But, for the non-age issue golfers, moving forward seems like a concession, an abandonment of hope with regard to improving or meeting the challenge, and on that score, I agree with you.
But, again, we have to bifurcate that group as well.
Some, for various reasons, play from tees which are clearly beyond their ability, and for them, moving forward isn't a bad idea.
Think of it as being sent to the minors until their game is ready to meet the challenge of a longer course.
But, for the others, they should aspire to meet the challenge, they should aspire to improve their games and not concede by moving forward